Patent GB-190426667-A (GB)
Title: Improvements in Braking and Clutching Devices.
Inventor: HALLOT PAUL
Filed: 1904-12-07
Granted: 1905-02-16
Abstract: 26,667. Hallot, P. Dec. 7. Brakes.-An arrangement of brake consists of a disc a, Figs. 1 and 2, formed in one part with a sleeve e which is keyed to the axle to be braked, also of a sliding clutch piece b operated from a fork i, and of an intermediate crown d of the shape shown. A piece c with radial ribs f is screwed on to the sleeve e, and carries weights g which are held in place by a spring h. When the axle reaches a certain speed the crown d rotates with the disc a, and the operation of the clutch piece b causes a braking action between the conical surface n of the pieces b, d. As the speed of the axle decreases, the centrifugal force of the masses g is not sufficient to rotate the part d, so that the braking action is lessened with the speed, being then between the flat surface m of the piece d and the disc a, together with that between the rotating masses and the inside of the crown d. The piece b can only rotate a small amount since the cable k of the steering-gear is wound round it. The part c is further secured by a pin o, and its weights g are adjusted by filling in with lead pieces q. Blocks p of plumbago or other solid lubricant are inserted in the braking-surfaces. The lubricant for the piece b is supplied at a channel r and escapes at a hole u, being kept from reaching the braking- surfaces by dished plates s, t, arranged as shown. The spring h may be fitted with pieces v, which, in rotating, come against the edges of notches formed in the masses g and cause it to bow outwards and increase its clutching effect on the crown d. The crown d may be dispensed with and the arrangement shown in Fig. 3 used ; also, the cable k may be replaced by a lever w, Fig. 4, which has one end connected to the steering-gear and the other abutting against the piece b. A doubleacting arrangement is shown in Fig. 5, in which the pieces a, c are cast in one, and the two clutch pieces b are operated simultaneously. In another modification, a second set of masses are arranged to prevent the axle from rotating above a certain speed, at which speed these rotating masses bear outwards against the clutch piece b, which is laterally elongated to receive them. The brake apparatus is shown applied to an automobile in Fig. 16, in which the cable k, being operated from a rod 45 by the foot of the driver, causes wheels 27, 28 to rotate, the rotation of the latter being conveyed to a spring-controlled lever 31, from which the brakes 26 are worked by cables 33. Skidding of the wheels is automatically stopped by the ceasing of the action of the clutch. An arrangement 34 for regulating the amount of braking is introduced on the rod 45, and consists of a piston 39, Figs. 18 and 19, which is made to slide in a cylinder 35, by turning a screw 38 from a milled nut 44. A spring 42, of previously determined power, together with regulating-rings 43, is inserted as shown, and the piston is provided with pins 40 which slide in slots 41 in the cylinder. The rod 45 is connected at 46 so as to allow the screw 38 to rotate, and a locking-nut 47 is provided. To set the spring for various braking effects, an index 48 is fixed to one of the pins 40, and has arrows 49, 50 which move over scales, the divisions on which represent load carried. The upper scale and arrow 49 are used for dry weather, and the lower for wet weather. In a modified way of regulating the braking effect, the stroke of the foot-pedal 52, Fig. 21, is adjusted by moving a stop 51 backwards or forwards by screw arrangements, the amount of such motion being recorded by a pointer 57 through a cable 56. A divided scale 58 is set to one of the divisions on a segmental dial, which represent the degree of adhesion for the day, and the stop 51 is then adjusted to bring the pointer 57 to one of the divisions on the scale 58 according to the load to be carried. With such an arrangement, a spiral spring is introduced in the rod which actuates the brakes. In another modification, the motion of the foot-lever 25, Fig. 23, is controlled by a spring 66 which presses against a lever 62, pivoted at 63 and having a rounded head 61, against which the foot-lever is pressed. The arrangement is fixed to the vehicle floor, and has slots 65 for adjustment. Skidding of the wheels may be obtained by moving the foot-lever beyond the head 61. For equalizing the braking effects on the two wheels of the vehicle, those ends of the brakes 26, Figs. 16 and 25, which are not connected to the cables 33 are joined up by cables 68 and bell-crank levers 69, so that excess braking on one of the wheels is conveyed to the other. A tightening-arrangement 70 is inserted in the cable 68, and springs 71 in the cables 33.